"Asthma, hay fever and eczema are allergic diseases that affect different parts of the body: the lungs, the nose and the skin," he said. "We already knew that they were similar at many levels. For example, we knew that the three diseases shared many genetic risk factors. What we didn't know was exactly where in the genome those shared genetic risk factors were located."

"This is important to know because it tells us which specific genes, when not working properly, cause allergic conditions. This knowledge helps us understand why allergies develop in the first place and, potentially, gives us new clues on how they could be prevented or treated," Dr Ferreira added.

"We analysed the genomes of 360,838 people and pinpointed 136 separate positions in the genome that are risk factors for developing these conditions," he continued. "If you are unlucky and inherit these genetic risk factors from your parents, it will predispose you to all three allergic conditions."

He said those 136 genetic risk factors influenced whether 132 nearby genes were switched on or off.

Dr Ferreira also stated that these genes the risk of asthma, hay fever and eczema by affecting the immune system work.

"Importantly, we have identified several drugs that we believe could be targeted at some of these genes to treat allergies. The first step would be to test those drugs in the laboratory."

The study also examined if environmental factors might affect whether these genes are switched on or off.

"We found that this could be happening for many of the genes we identified," Dr Ferreira said.

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